Land of chips and lagar is the the title of a popular version of the song "Land of Hope and Glory" adapted to suit Cockneys way of life in the United Kingdom. The song first appeared publicly in the TV Series "Spitting Image"
The lyrics of the popular Cockney song:
"Land of chips and lager,
'Ere we go, 'ere we go,
Three Tandoori and chips, then
Hire a crap video,
Oggy, Oggy, Oggy!
Oi! You staring at me?
You're going to get your,
Fucking head kicked in.
You're going to get your,
Fucking head kicked in."
A bunch of Cockney Yobs are at the "Last Night of the Proms" music concert, and as soon as "Land of Hope and Glory" start playing, the yobs start singing along using their version of the words, starting with "Land of chips and lager..." etc
To drink huge amounts of beer or lager simply to get very, very drunk. Not to savor the taste or flavor, but just to get wasted. The phrase is used in London and parts of England, usually associated with wide-boy or East-end types, although a trip to Ibiza might be rewarded with a few examples too.
"C'mon boys! Let's get lagered-up! Look at the locals, they're waiting for us to get proper pissed! C'mon boys! Lagered-up! Lagered-up! Waaay!"